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From Jason Rutherglen <>
Subject Re: Getting an IndexReader from a committed IndexWriter
Date Fri, 15 May 2009 01:47:30 GMT
Hi Shay,

I think IndexWriter.getReader from LUCENE-1516 in trunk is what
you're talking about? It pools readers internally so there's no
need to call IndexReader.reopen, one simply calls IW.getReader
to get new readers containing recent updates.


BTW I replied to the message on

On Thu, May 14, 2009 at 6:37 PM, Shay Banon <> wrote:

> Hi,
>   I just had a look at the job done in IndexWriter in order to get an
> IndexReader with all the current ongoing changes done using the
> IndexWriter.
> This feature is very useful, and I was wondering if another feature, which
> (I think) is simple to implement (compared to the previous one) might make
> sense.
>   Many times, an application opens an IndexWriter, does whatever changes it
> does, and then commits the changes. It would be nice to get an IndexReader
> (read only one is fine) that corresponds to the committed (or even closed)
> IndexWriter. This will allow for a cache of IndexReader that is already
> used
> to be updated with a fresh IndexReader, without the need to reopen one
> (which should be slower than opening one based on the IndexWriter
> information). The main difference is the fact that the mentioned
> IndexReader
> could still be reopened without the need to throw an
> AlreadyClosedException.
>   Does it make sense?
> Cheers,
> Shay
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